YouTube is the largest repository for these videos. While YouTube doesn't provide a direct "Download MP4" button for all users, it is the native format for the platform.
If you are looking for instructional content rather than just clips, these sites are highly rated by educators: Download Science experiments mp4
: Known for high-quality animated science lessons. While they don't always have a direct download button, they are widely recognized as a premier educational resource. Top YouTube Channels for Science Experiments YouTube is the largest repository for these videos